Hot-air furnace



(No Model.)

H. B. DBWQ-nr. HOT AIR PURNAGE.

/lllI//lllrllll/l//lp [nnen/0n' M'Xness'es:

N. Pains nowmhogmpm. washing, A c.

UNITED STATES PATENT OEFIcE HOSEA.B.'DEWEY, :OF MILWAUKEE, WISCONSIN.`

HOT-Al R FURNAC E.

SPECIFICATION forming part of Letters Patent No. 324,239, dated August 11,1885.

Application filed October 10, 1884. (No model.)

To a/ZZ whom, it may concern,.-

Be it known that I, HOSEAB. DEWEY, of Milwaukee,in the county of Milwaukee, and in the State of Wisconsin, have invented certain new and useful Improvements in Heating- Systems; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to a system of equalization of temperature between cold outside air admitted toa furnacecasing and the circulating air heated by said-furnace and returned thereto, after having been used toheat the apartments through which it passes, as well as to the said system of circulation, all as will be more fully set forth hereinafter.

In the drawings, Figure 1 is a vertical crosssection of a portion of a dwelling-house tov which my system is applied, and Figs. 2 and 3 are modifications of the construction of the air-chambers shown therein.

A is a furnace, of any ordinary construction, located within a casing, B, in a lower apartment-such as the basement or cellar of the house-and having ordinary pipes, G G, to carry the heated air to the rooms L L, to be heated through the registers H H. C is a temperatureequalizer, air-box, or air-cham ber, which (in Fig. l) is divided into two compartments, an upper one, c, for the reception of the cold outside air, (brought in from outdoors by a pipe, E, guarded in the outside wall by a slide'or damper, K,) and a lower compartment, c', for the return or circulating air from the rooms L L, brought by the pipes F F, communicating with the registers I I. The pipeE is of wood or other non-conducting material, and the outside of the airbox C is of like material, (everywhere represented in the drawings by section lines or double lines with section marks between,) while the pipes F and the under or exposed surfaces ofthe compartment c and of the pipe` D, leading therefrom, are of metal, (represented in the drawingsby single black lines,) for purposes hereinafter more fully set forth. The pipe D leads either into a passage, B', connecting with the furnace-casing B, as s hown in Figs. 1 and 3, or else directly through said passage, and opens within the casing B, as shown in Fig. 2.

In Fig. 2 I have shown another construction of air-box C from that represented in Fig. 1,

and' haverepresented the compartment c as an independent receptacle for the cold air, entirely surrounded by the air-chamber c for the return or circulating air, instead of one chamber being located beneaththe other; and in Fig. 3 I show a disposition of the pipes E and F just the reverse from that shown in Fig. 2, but otherwise substantially the same.

In all the forms shown, and which might be further varied or modified in many ways without departing from the spirit of my invention, the great point which I have aimed at is to keep the currents of cold outside air and heated return or circulating air separate, and without permitting their drafts to interfere with each other until they are united just within or at the entrance to the furnace-casing B, and at the same time, just before such union,'to equalize their temperature, as far as possible. This is done by means of the large surface exposed of the compartment c and pipe D, of thin metal, which permits or aids the said equalization, and especially tends to cool the heated return air by the proximity of the cold outside air, and yet, by reason of the tight pipes and the air-box, prevents any cold air rushing up through the registers H, as the proximity of the warm return air will modify its temperature before its admission within the furnace-casing B. As the temperature of the united currents of air at this point will naturally be much colder than that of the return air, the draft will be increased, and hence the circulating air will be drawn rapidly and constantly from the apartments heated, and hence the ventilation of those rooms will be insured without the presence of any currents of cold outside air.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. A heating system, which consists, essentially, of an upper apartment, a lower apartment, a furnace or heater within the lower apartment, awarm-air chamber inclosing the heater, a pipe which leads from the warm-air chamber to the upper apartment, an equalizing air-receptacle in the lower apartment, a partition in the air-receptacle, a pipe which extends from the space outside the building to the space within the air-receptacle at one IOO outside the building to the compartment c, a passage leading from the compartment c to x5 the casing B, and a passage leading from the compartment c to the easing B, substantially as and for the purposes set forth.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of NVisconsin, in the presence of two witnesses.

I-IOSEA P. DEWEY.

Witnesses:

S. M. NICHOLSON, H. G. UNnERWooD. 

